docs: async def message(request):
      """
      To send a message, go to 0.0.0.0:8000/message/?msg='insert message here'.
      """
  
      msg = request.get('msg')
      if msg is None:
          return request.text("To send a message, go to 0.0.0.0:8000/"
                              "message/?msg='insert message here'.")
      await app.webhook.send(msg)
      return response.text("Send.")